Memcache fix for php7.4

Cache/Memcache.php

@@ -49,7 +49,7 @@ class Memcache {
 		}
 
 		$key = $this->prefix . $key;
-		return @$this->mcache->get($key, 0);
+		return @$this->mcache->get($key);
 	}
 }
 ?>
\ No newline at end of file